Circuit System Testing
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect for any condition that can reduce idle speed by increasing engine load.
- Incorrect torque converter clutch (TCC) operation
- Accessories that require additional torque to operate
- Excessive deposits in the throttle body-Refer to Throttle Body Inspection and Cleaning .
- Restricted exhaust-Refer to Restricted Exhaust .
- Mechanical conditions that limit engine speed
- Inspect for any condition that can increase idle speed.
- Vacuum leaks
- Unmetered air entering the engine, after the mass air flow
- A faulty positive crankcase ventilation (PCV) valve